Add linter checks to GHA & Fix code to pass lints

Add linter checks to GHA & Fix code to pass lints.
The linters added are:
- whitespace: Tool for detection of leading and trailing whitespace
- gosec: Inspects source code for security problems
- gci: Gci control golang package import order and make it always deterministic
- misspell: Finds commonly misspelled English words in comments
- gomnd: An analyzer to detect magic numbers

The file utils/utils.go is excluded from the checks of gomnd, as uses magic numbers through the code

test/lang.go

@@ -313,7 +313,7 @@ func (p *Parser) parseLine() (*Instruction, error) {
 			c.Literal += line
 			return c, err
 		}
-		if fee > 255 {
+		if fee > common.MAXFEEPLAN-1 {
 			line, _ := p.s.r.ReadString('\n')
 			c.Literal += line
 			return c, fmt.Errorf("Fee %d can not be bigger than 255", fee)

test/txs.go

@@ -143,7 +143,6 @@ func GenerateTestTxs(t *testing.T, instructions Instructions) ([][]*common.L1Tx,
 		default:
 			continue
 		}
-
 	}
 	l1Txs = append(l1Txs, batchL1Txs)
 	coordinatorL1Txs = append(coordinatorL1Txs, batchCoordinatorL1Txs)